• active_support/deprecation
• active_record/associations/errors

• 模組 ActiveRecord
• 模組 ActiveRecord::Tasks
• 類別 ActiveRecord::ActiveRecordError
• 類別 ActiveRecord::AdapterError
• 類別 ActiveRecord::AdapterNotFound
• 類別 ActiveRecord::AdapterNotSpecified
• 類別 ActiveRecord::AdapterTimeout
• 類別 ActiveRecord::AssociationTypeMismatch
• 類別 ActiveRecord::AsynchronousQueryInsideTransactionError
• 類別 ActiveRecord::AttributeAssignmentError
• 類別 ActiveRecord::ConfigurationError
• 類別 ActiveRecord::ConnectionFailed
• 類別 ActiveRecord::ConnectionNotDefined
• 類別 ActiveRecord::ConnectionNotEstablished
• 類別 ActiveRecord::ConnectionTimeoutError
• 類別 ActiveRecord::DangerousAttributeError
• 類別 ActiveRecord::DatabaseAlreadyExists
• 類別 ActiveRecord::DatabaseConnectionError
• 類別 ActiveRecord::DatabaseVersionError
• 類別 ActiveRecord::Deadlocked
• 類別 ActiveRecord::ExclusiveConnectionTimeoutError
• 類別 ActiveRecord::InvalidForeignKey
• 類別 ActiveRecord::IrreversibleOrderError
• 類別 ActiveRecord::LockWaitTimeout
• 類別 ActiveRecord::MismatchedForeignKey
• 類別 ActiveRecord::MultiparameterAssignmentErrors
• 類別 ActiveRecord::NoDatabaseError
• 類別 ActiveRecord::NotNullViolation
• 類別 ActiveRecord::PreparedStatementCacheExpired
• 類別 ActiveRecord::PreparedStatementInvalid
• 類別 ActiveRecord::QueryAborted
• 類別 ActiveRecord::QueryCanceled
• 類別 ActiveRecord::RangeError
• 類別 ActiveRecord::ReadOnlyError
• 類別 ActiveRecord::ReadOnlyRecord
• 類別 ActiveRecord::RecordNotDestroyed
• 類別 ActiveRecord::RecordNotFound
• 類別 ActiveRecord::RecordNotSaved
• 類別 ActiveRecord::RecordNotUnique
• 類別 ActiveRecord::Rollback
• 類別 ActiveRecord::SQLWarning
• 類別 ActiveRecord::SerializationFailure
• 類別 ActiveRecord::SerializationTypeMismatch
• 類別 ActiveRecord::SoleRecordExceeded
• 類別 ActiveRecord::StaleObjectError
• 類別 ActiveRecord::StatementInvalid
• 類別 ActiveRecord::StatementTimeout
• 類別 ActiveRecord::StrictLoadingViolationError
• 類別 ActiveRecord::SubclassNotFound
• 類別 ActiveRecord::TableNotSpecified
• 類別 ActiveRecord::TransactionIsolationError
• 類別 ActiveRecord::TransactionRollbackError
• 類別 ActiveRecord::UnknownAttributeReference
• 類別 ActiveRecord::UnknownPrimaryKey
• 類別 ActiveRecord::UnmodifiableRelation
• 類別 ActiveRecord::ValueTooLong
• 類別 ActiveRecord::WrappedDatabaseException